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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8892f55443170d45f0eba517b41d565a714f6152b6c3506a00ed74a27d6a7620' 
  AND token = 'e4qDiYA7paCkM46s77yoH0GflSoahFgLt8AmL9D93IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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