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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbff06358bfb9e32760d390650c2b15ae4c281dfc9be6a891ce975240017f33c' 
  AND token = 'pUW3wQjd0RfauUvSCqZR5zAUMUL12w2zNI31DTYOyoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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