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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b6aa2e45b9b2cc288b8c857d7ef88746022f7713e0c8b6c71ee6f57c82ca5f' 
  AND token = 'mSRHc2tS8GccRV47s8+gejBs6YmazLslzJB+JBFv2Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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