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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509f64937578f028fe6e66ab1e9ac3a33b43ab2e76c4c6a63536b4e6cf36a18f' 
  AND token = '8jWaROkUJnroj8gl3Y+ymq99Shh7ILwZXquRfNnEX1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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