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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dea001b1029820c6e9b330d308ca7d36961c1c82df37e24ca638a3350e6b15bf' 
  AND token = 'YDmcEmqb2gJ1tRztlju2zXJdB3fIUp6nw2tYQzjdm08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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