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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807b2459a2c52fc013d1f7f5f6a44e7a41bb02c4435435af1cd47ee09e897876' 
  AND token = '7vXFbQdTVvSlUy3LYhDrcoCuujCoMdOHIg2HC6fxHKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}