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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9670a5eaf6c8ce37dcd20ff597eb21d1e17a05068fd5e12f9ea8881abd0294dd' 
  AND token = '0qghvGaufZrDIDcMLhOa/rrwVYOPlv5E4rKtRSCf0Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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