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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109e1471e472c0e1b457e9ef64a91c25f8774f50e0b05d988ebe51a61c362bda' 
  AND token = 'gSjmx+vYsukP3RokKD+L1cdkPh+m33acyZdBQ/kPz1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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