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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602e402f8b8fb3f8c3f7b457e5fe180ab3a2940057993d9fe3511675698264e7' 
  AND token = 'kM3vMEbrpM+8Ozw01AOtP8rOP+3KMc5rwoTmoVxA3yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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