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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40d7ad0999a2da868fe84d8c2a17b78a0ffe12c20dd112318d687c31e04fc1d' 
  AND token = 'z7br0KY5b1FmqqqcEF8sEXRAR8pIw7pABo8I5Y3nvow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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