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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db1634873a906ffe98fbf2dffe51c9a8feb386be1e2373f22333923d16bd7700' 
  AND token = 'FpTZ6nDC/cim3pTfM9zwUhWOsj3NdgB+V/oU1awX4x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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