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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a09abbdfcd7b82a71822e61b9534a1f253d55d0d26f68ee5f1a0904e6c3cd7e' 
  AND token = 'Mr2JsnEPPYUkLiS3KmQO34xwrz2oBnUk5FwzV2PBsCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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