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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dffcc552f7b45c9014118f7c8ccb806d5ebb01be7dcfd41554aad1998639216' 
  AND token = 'shvdWktAsnwne+XJBLUcwHCEZCOMv3l32Epw5Ms4pgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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