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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19515ada4cb32427a2cb31f23d05e74f7d98e21ce45e918cc7c2608f73e11b2b' 
  AND token = 'd2myvn4MBjSX5ZYADVKQgaHy61kZMZFvYinZEVwZuiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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