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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbc359b6cbd3fe638f998f7ee926cd8e560581cb0f2b8ab58c11b8fe742f7b0' 
  AND token = 'EytybUap8JRz0ChkHRo8Mnv6Qfh3OdGmCWf37H0BQjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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