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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5feaff896bdc0244578d5e76c9e4163b1d456c29fb86b7444dc3556a9561d53d' 
  AND token = 'OdBybJUnCzMx0z1tMKmgu1M73cyHtm0HzQ4Ztn04Qos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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