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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be74c74d8c7458b36ce393aa6c6d637d2e56f0cda95deb6f22889040d71fb6d2' 
  AND token = 'f7VV1T+SOHxK58W9jN0ITWTwAVdyxYraNf3N/69TfR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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