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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1cd8c7174e66ffac025be15defc5900454c36cc1cc584cac491d67806d10f6' 
  AND token = 'qIh8vggYAxoMq+akP1QCdzDznmMPTMlHen7NV+w51fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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