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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad0ab3095ee4be8a91c081c6531e322f80716d5ddc2df47f5d10e135a9b06b1' 
  AND token = 'W3xj2Iz/6fF1mEzf5K1md14CRW93F8uZrk2k7S3ulAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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