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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351d88d83736a273d849e1a91b53f5c0dbeddabb14a9f220049db9c087ac7cae' 
  AND token = 'ovfnWt5xf6hfdqZInEgXGcx7K79KDARcdJGjOfu4Fwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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