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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd020d6566932cf122be1b568b0540ea6f758770d4f63be87b9ec5b08d0cb4c' 
  AND token = 'etyzwPsEad766nN2ranPaV+w3mno9+kjKTW5oENGhDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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