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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1d9ca85de6155f8cb5abdcd2a4e1bd6e9080f100223dbec1a36eb2b3570f02' 
  AND token = '9IuI29+3tbexUTUixm5qNlcnqoMml92DGMWObMPa4Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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