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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a93cd539b3b69bf5c991a014924eaf596c976b858f7fe93861ec05ee11dca0' 
  AND token = 'LsDE3EsQJquptNCKt1WdJ5e37OUftSwz+jdqbd93q/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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