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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b9102c5cd6e72e9e1aec9a0a78bfec01e44103b06af8b09c81ab7c9966327f' 
  AND token = '5p7Qee9Rv0FQkMlGNV9Y7gZYb6GeXhOm0w1uvCvVdhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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