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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39127d5c64590c64a08bbae659af1e4b37f16cca6102a0a5633ca778394eda20' 
  AND token = 'BWWrtRzCaLYdccsny1fO3OxVMQ7pfU3ljiNDPbFCQ34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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