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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba5e03a60e01ebcabbca6af1f1ecb684b8e9ea1128de0c5fef28e726b7a6466' 
  AND token = '+6GZf6h5NMALjpDeq9VSIAla7AHxeSus67jUxpUJK8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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