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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6ede2c96921a662d73c240f8e40f414ac3d32cc92b6850d9f793da434098b8' 
  AND token = 'ex5mms/0T53gIeVNttLg3/ANQWPqug1p5J20we5JfCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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