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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1507b381a41f32c12f67b0bb2c642e2882f45c0ff2dde7cd40a0d77c8a70341a' 
  AND token = 'feA7wJ5V2J0HacUCuQdN1Wk47SZc/OHsUHg4nmDa/KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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