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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a497483361160efa54ca8d082360571b65b203b91b67bfee116de5e50bce1e7e' 
  AND token = 'xFhqSCTAcxTukbvws2p0KqJBS1qkMnx4oTayApJM6qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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