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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42618ad292819be243eff8f8ec30326f69d3f08aae143169c121a35776883e5' 
  AND token = 'ySYkni6wHNpJgyRKsdvr1NK0O79b7CstYmj0RzgBo5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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