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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71177fbb04e0e868c15027581bff130aa69f5a9752fb82c8d7adde2d26b011e7' 
  AND token = 'XIDwg4wSMgVinmc9U0lsgCux2LklyNHGHI1LbMEhCo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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