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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0431b86581d811d33686df485fd768e57451f98b417a5c15601a3a4fe6217185' 
  AND token = 'M24ZS0HAg2OG/cXXD9qBKUNWugy3Bd4g4IGwbxkYZgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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