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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a8aab49d5955836f5c3da5c7eb04e60eaaadd9e77607dc0e3ace404c9a3bd3' 
  AND token = 'yOdxyTkoEsuBV66CPplH7f07ssF9YrbR7djn8VSn81k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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