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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd9d3deb28e807823ab69a2af5695e3d6b244c82307513e268d0dbd04f43a45' 
  AND token = 'NTuvOd3+OH6uITPkf0Bn2tgnKHfR0TdR87tbizB3aBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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