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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdbb3a9e9d8627a21c6d38fc7c16d57540c662c8d86d6b873d70fd4a9a85d56' 
  AND token = 'p027REwGe/BgSJU2p+afQM0945OZOCXu5xTbDP4r/kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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