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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae2867087359054429108f843654f7814417c87f799fa00a17f56c61290271d' 
  AND token = '6/UoP66/Q70nh7ukR/spiefjt47CONLfb3pqLFiZYn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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