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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6e0530ab9acd81777d2532b5f30781cf726db6a97062013c5dcafcfb21e911' 
  AND token = 'bGsCcG7Jeuw9w9W4dxWYmRpawKm5EOSPot+Q48qEq0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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