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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795dc8cc3d70a1df8f28f72c65645c72130da36a7f24d5093b52f5bfb8b985bc' 
  AND token = 'zcYcR3gJjD78MOzoC4vX13RWl1LiV3APw5pWArxqftk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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