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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64161bab784663e2b78728c7a03ad7f195f7034aedef0d9712901e9a69b2721' 
  AND token = 'BLAO9asYXIJ87tN2Xu32Fl/qWovwEdRzXYhaCBI07Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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