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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925d079a232fbc48bb8c590002d46b07f9d432b14463a03914ecad0de1b44c86' 
  AND token = '+r7XDt3SYlDvcLrf2ektmnGKvWeDExXdjZ+ojh3JBAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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