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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a833dcfe5f0253b117e81fc10701fc6b1e8631458b8279c44a6a2c3136a4ae7f' 
  AND token = 'cTyp8quoHU6olE3P4X7Wqu/wPiMxcdLAGi27Uj0Z52M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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