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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca313a3a384058b46746c2318df570e82eb62e007feffe57ded5850e818314a4' 
  AND token = 'vv9TQT58LiAiiaH7iF/Gy5iHMH9KS709ee3bMfQI5ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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