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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08b86c55eb56d22a4e609d9668068983435587a79ee26e7aa9438c70e9bd2a0' 
  AND token = 'yJ4+ihtJM2ObpUoxUMH/6hvLtBlv7fNTjPVcg9XFSKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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