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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a3c01d9fea87ce5fb7a720be1ca908bddb24817bcf12bd134584f817931b53' 
  AND token = 'JQSrlrB5VnmsG8EKZviZEGH/FaGS6LPkbyl/7CRJ1cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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