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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6283a1247bc33f3d1e899e8528107fd4ee8fb01bf61b28094e4428c33c7f188' 
  AND token = 'u24DEhMgt5DfSD82RkRSVH5Dk0nhCZghewFK7U1zoMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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