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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938a2f51c4e341af75d2cf220f9f99811c08e030078d0e98ff58e9151e706fcb' 
  AND token = 'MSmQUbjFLeSIK6u9D5kquCDJMfKnDYxEUR2R6cPo8BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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