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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9098fe6f0385be40fc02233ed035e5d17396ada642c4bffa34386ab4435c3636' 
  AND token = 'XORbDuPpA7oFgkWREW7Yw+KZ+uBDBRnSBiI8PDqeVT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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