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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ee8b4f7dba7c350dd338d1a7be6e74586f6a045a62b5fd0a35c1184405b448' 
  AND token = '5uc7J0gvIcMWZO/FHBK3ji2In34t5JPs//BcPiHw2LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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