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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd878bda72d33717bd45ff789294e8492003b8bbaf4c05d3738a44b7a965b8074' 
  AND token = 'lBgqLQu4GoNVvg7UOfI7Cb7ZX1I465HpzvRO4PzxM48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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