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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412e6dd4121230ae15d31273e392e7b16c70a4b08415916f7f8f8e4c91285c5d' 
  AND token = 'HS/WhnQ+T5xrSghsTDidu+Vaom37xCE8I46tVyWzl/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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