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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df58d83ed9ed52bb25c6142673711242b1428e4df02921cd2c7fa91673f155f' 
  AND token = 'PoHk0qAp/buoGhFwZUfNjNcjv9YYjqIpd6qR1Qi01o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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