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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d31f08c35a329cc4eb5235149274f3ab58958b892fb3c957e6981958077834' 
  AND token = 'mevooYCNom194/80BHjhl35J5MVTYWNZGG5uEUBPVck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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