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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24bc636edd906ae1c21a559938bc6af183fd7a860fe2775b20f93d3b514b93d' 
  AND token = 'ZZiFn38AsrqjuBNkD2NbQDv3skHRD/UBJ11Re9EfPDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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