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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b84adf3171a68e9e0755b3ab66d1d45e33184015fa4c5e8083f8978e6a8593d' 
  AND token = '1jE4vbUF8mEdqn/B92Ti6C6YnSRT6nnaSRrJ8CY2AaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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