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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c1e93de451572861d3e8de30da6393ec31c0f1ee39b5e6fbf44960fe4be9ad' 
  AND token = 'pjV5UlgT1D8g8jKdObnUrFmUavCaP1ZRuAY4epNLIMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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