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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89883b7546848afd5c5230e64f4c3afbb664afa8fb996afea9b9080a5b09668f' 
  AND token = 'xleJj1qgig29MmQOpiCBauYoH4llQf6AFDCBpP9WLdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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